Please don't throw it in the bin! Either a local studies section of your library service, or the nearest regional archives, might either accept it into their collections or help you identify an 'even better' recipient. In addition, as Chewn has suggested, there will be people on Ab who can help you find out if there are any descendents of the writer as they ought to be offered first refusal. Or if you find yourself at a loose end, scan it and put it online on flickr so everyone that wants to can see it.